138 
IOWA ACADEMY OF SCIENCE Voi.. XXVIII, 1921 
even linseed oil meal added to this combination is not to be consid- 
ered as a success — it helped a little but not much. 
The addition of a limited quantity of buttermilk, however, to a 
corn and corn oil cake meal ration was in the interests of efficien- 
cy. Where shelled corn and tankage were fed in separate feeders 
the weight on October 27 after 120 days of feeding was 180 
pounds, but, as mentioned, where corn oil cake meal was substi- 
tuted for the tankage the weight was only 114 pounds. There is 
a wide range between 114 and 180, sixty-six pounds, which may 
be remedied by the addition of proper supplemental feeds to the 
corn and corn oil cake meal combination. Buttermilk was success- 
ful in increasing the weight of these pigs to 164 pounds. In this 
case not quite five pounds of buttermilk was fed daily per pig in 
addition to the shelled corn and corn oil cake meal. We do not 
think that there is any question that had this buttermilk, or even 
skim-milk — its practical equal — been added in larger quantity the 
gains would have been favorably increased so that they would 
have approximated or even have excelled the corn and tankage fed 
group. 
In order to gain a more adequate knowledge concerning the im- 
provement of a corn and tankage ration or a corn and hominy ra- 
tion by the addition of corn oil cake meal we planned to feed six 
groups of pigs, placing six pigs averaging about forty-eight 
pounds each in weight and about seventy-seven to eighty-one days 
in age to a group. All groups were fed “Free-Choice” style. The 
test was begun June 15 and ended October 17, 1917, after 124 
days of feeding. 
These lots were fed : 
Lot 
I 
Lot 
II 
Lot 
III 
Lot 
IV 
Lot 
V 
Lot 
VI 
Shelled corn self-fed plus meat meal tankage self-fe,d plus 
block salt self-fed. 
Shelled corn self-fed plus a mixture of meat meal tankage 1 
part, com oil cake meal 3 parts self-fed plus block salt self- 
fed. 
Shelled corn self-fed plus meat meal tankage self-fed plus 
corn oil meal cake self-fed plus block salt self-fed. 
Hominy feed self-fed plus meat meal tankage seli-fed plus 
block salt self-fed. 
Hominy feed self-fed plus a mixture of meat meal tankage 1 
part, corn oil cake meal 3 parts self-fed plus block salt self- 
fed. 
Hominy feed self-fed plus meat meal tankage self-fed plus corn 
oil cake meal self-fed plus block salt self-fed. 
All of the above were fed on timothy pasture, a pasture some- 
what comparable to bluegrass under our conditions — really not a 
good pasture from the standpoint of a lone pasture supplementing 
corn. 
